i can assure you we won't be driving petrol cars in 50-100 years time.
How can you make that assurance?
The internal combustion engine is well over 100 years old, as is the lead/acid battery that starts it. The jet engine is 70 years old.
Technology changes much slower than you think. The only sphere of human endeavour that is changing rapidly is the computer and the entertainment it allows. Engineering progresses in measured steps.
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